Well if I had to guess... I'd say that once the piston started coming apart...the rod had to beat the **** out of all of the the chunks of pin boss hanging on and bits of it passing by...when they got out of the way...it popped a nice little hole somewhere just above the middle probably... once that Rod came back around it hit that hole and just chiseled it's ******* way right up to the top of the bore.lol
